small improvised explosive device. that would be, in other words, a homemade bomb. evan coleman is an msnbc terror analyst. evan, what do you make of what we just reported? >> yeah, well, i mean, unfortunately these days there are a number of different groups out there promoting among its membership and its supporters the idea they should build their own small, you know, improvised explosive devices and set them off in crowded areas that are, unfortunately, you know, not necessarily prime targets but they're soft targets. and if that's -- if this, indeed, is a small ied, the fact is is that you have a group like al qaeda in the arabian peninsula which put out an english language guide including something titled how to make a bomb in the kitchen of your mom. it's something designed to allow small grade extremists to be able to carry out something even on this scale. i think it's important even if this is determined to be a deliberate act, or politically or ideologically motivated, to keep in mind something like this is well within the capability of one small determined extremist.